Abstract
Poly(indenofluorene) (PIF) has an absorption band at about 780 nm. Femtosecond pulses from a Ti-sapphire laser at 800 nm can induce saturation of the absorption leading to strong nonlinear optical effects. Z-scan studies of solutions of PIF show that the bleaching of the absorption can be described by an empirical formula: α=α 0/[1+(I/I sat) 0.5] with the saturation intensity I sat on the order of 100 MW/cm 2. Time-resolved degenerate four-wave mixing and pump-probe measurements on films of PIF show the presence of oscillatory behaviour which is interpreted as a coherent transient (Rabi flopping). The experimental pump-probe transients are compared with those calculated using a standard two-level model described by optical Bloch equations with the relaxation times T 1 of about 2 ps and T 2 of about 200 fs.
| Original language | English |
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| Pages (from-to) | 305-310 |
| Number of pages | 6 |
| Journal | Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics |
| Volume | 22 |
| Issue number | 1-4 |
| Publication status | Published - 1999 |
| Event | Proceedings of the 1998 4th International Conference on Organic Nonlinear Optics (ICONO'4) - The 8th IKETANI Conference - Chitose, Jpn Duration: 12 Oct 1998 → 15 Oct 1998 |